average family sizes in a sentence

• Since the one-child policy began in the 1970s, average family sizes have shrunk to 3.6 people per family from more than 4.8.
• The population, as recorded by the Census of Ireland, peaked in 1996 at approximately 10, 800 and has fallen by about 12 % since then, as falling average family sizes have outpaced residential construction.
• So for any prime minister to have lost a child is 1 % and the probability of two successive prime ministers to do that is 1 : 10, 000-so I'd say the odds of this ever happening before in the UK are rather slim-but there are around 200 countries in the world-almost all of them with much worse childhood death rates and almost all with larger average family sizes.
• It's difficult to see average family sizes in a sentence .